I used the back up as instructed for backing up my card with the folders and songs on them. I had 19 folders with 20 songs in each. When I put the card back in the keyboard KN7000 it was all messed up. I then went back to the computer and went to restore the card. It said that there were other songs there and in order to do that they had to be deleted. I hit okay. It started to delete and then it stopped and said that one file could not be deleted. I hit okay and it quit. I put the card back in the computer and it is now blank. I lost all of my songs that I had made up with the backgrounds.I tried doing it again to no avail. Anyone else out there ever had this problem with the sd card and do you have any suggestions or should I just kiss them all goodby. Thanks